Telegraph relay



Mar. 6, 1923. 1,447,361. C. H. TEEGARDEN.

TELEGRAPH RELAY FILED SEPT-25h 19ml*1 Patented Mar. 6, 1923.

UNITED STATES PATENT OFFICE.

TELEGRAPH RELAY.

Application Ied September 25, 1918.

To all whom t may ooncem Be it known that I, CHESTER H. TEEGAR- DEN, a citizen of the United States, and a resident of Washington, in the District of Columbia, have invented certain new and useful Improvements in Telegraph Relays, of which the following is a specification. p

My invention relates t0 relays and in particular to that type of relays used in ltelegraphy. The principal objects of myinvention are the provisions of a polarized relay which is biased to mid-position without necessitating an increase inthe force required to o erate the relay, the use in such a relay of abutting contacts which are closed under pressure and yet do not necessitate an increase in the operating force, the use of the biasing means as contact means, and the provision of means whereby said biasing means may be rendered ineffective so that the armature will remain in that extreme position to which it has been actuated. My relay is particularly of use in connection with my method of receiving telegraph signals which I have described in copending application, Serial No. 253,309, filed September 9, 1918.k

In the drawings, Figure 1 represents a plan view of my relay, Figure 2 represents a section on the line 2-2 of Figure 1, and Figure 3 represents a side 'view of my relay with the front coils removed.

In its preferred embodiment my relay is provided with four coils, 1, 2, 3 andy 4. Coils 1 and 2 are mounted on a cross-arm 5 by means of screws 6 and this cross-arm 5 is supported by a rack member 7 which fits within a recess in the post 8 and is reciprocated by means of the screw 9. The coils 3 and 4 are similarly mounted on an arm 10 supported by a rack member 11, which is received in a recess in post 12, and is operated by a screw 13. The posts 8 and 12 are secured to a base 53, of suitable material preferably insulation. It will be apparent that the screws 9 and 13 acting on the rack members 7 and 11 serve to reciprocate thevcoils.

so as to vary the spacing between the respective cores. Also mounted upon the base 53 are the supports 14 andl 15 each carrying a bracket 16 in which is journaled one end of the armature 17. This armature con- Serial No. 255,610.

sists essentially of a long shaft like part 18, extending between the two bars 16, and three tongues 19, 20, and 21, extending upwardly from the part 18. y The tongue 19 extends between the cores of the coils 1 and 3, while the tongue 21 extends between the cores of coils 2 and 4 and these tongues are adapted to swing on the trunnions 16 between the coils 1 and 2 on the one side andthe coils 3 and 4 on the other side.

The tongue 20 is provided with contact 22 extending through the tongue and secured in place by means of a set screw 23.

'This contact is adapted to engage, in the two extreme positions of the armature, with the contacts 24 and 25 which are in the form of screws provided with contactl points 26,.threaded surfaces 27 and heads 28. The threaded surfaces 27 cooperates with threads in the apertures 29 in the supports 30 and 31. These two supports 30 and 31 are carried by the base 53 in such manner as to be insulated from the supports 14 and 15.

Also carried by the supports 30 and 31 are brackets 32 and 33 which are practically identical. These brackets are insulated from the supports 30 and 31, and are provided with apertures 34 through which the screws 24 and 25 pass without contact. The bracket 32 is provided with a contact spring 35 supported from slot 37 in the bracket. The tension on the spring is regulated byl means of set screws 39 and the forward movement of the spring is limited by the shoulder 41 on the adjustable stop 45. The tension means 39 and stop 45 are both carried by bracket 32. The bracket 33 is similarly .provided with contact spring 36 supported in slot 38 and tensioned by set screw 40 and limited in its forward motion by theshoulder 42 of stop member 46 and the set screw 40 and the stop member 46 are similarly carried on bracket 33. Carried by the tongue 20 but insulated therefrom by means ofy tube 47 is .the contact plug 48 so positioned as to engage the contact springs 35 and 36. When the armature 17 and the tongue 20 are in mid-position and the stop members 45 and 46 are properly adjusted the contact yp1ug48 is of such length as to bridge the gap between spring contacts 35 and 36. Upon motion et the armature 1n either direction the contact a8 will disengage the opposite spring Contact and thus open the circuit between the two spring contacts. dUpon this same motion the contact plug 22 will engage the one or the other of the contacts 24 or 25.

Carried by the braclret 32 is an extension i9 in which is supported shaft 5() carrying at its outer end a head 5l and at its inner end a cam 52. This cam is positioned between the two contact springs 35 and 36 and is ci su''icient size in one direction to hold these springs back from engagement with the stops lll and 42 and prevent the contact t8 :trom bridging the two spring contacts 35 and "36. rllhis cam 52 is of insulating material.

"lt will be apparent from the above description that normally the fcontact i8 bridgesthe spring contacts 35 and and that this circuit is broken by movement or the armature 17 in either direction and by rotation of' the handle 51 to cause the cam 52 to retract the contact springs 35 and 36.

lt will further be apparent that normally noV circuit completed through contacts 2li and 25 but that a circuit is completed 'from one or the other of these contacts upon the movement oi the armature 17 in either direction to cause the plug 22 to engage the corresponding` contact 24 or 25.

Mounted inthe base 53 of my relay is a polarizing; means tor 'polarizing the armature 12'. inasmuch as l may employ any suitable polarizing means l have deemed it unnecessary to disclose any means in the drawing; l may state however that l prei'- erably employ horse-shoe nfiagnetsa extending in oppositeV directions 'from a line beneath the armature 17 and with their lilre poles together. l may also add that the coils 1, 2 3 and el. are so wound that when the ilu); in coils l and 3 `flow to the right that in coils 2 and fl: will Vdow to the lelt thus causing` the flux to "flow in a circuit through the i'our coils and the end bars 5 and 10. lt will be apparent from the construction above described that when the current flows through these coils in one direction will cause movement ot the armature in one direction and that current through the coils in the reverse direction will cause movement of the armature in the reverse direction.a and that each movement. will cause Contact to engage either contact 24 or 25 and also causo Contact 28 to disengage either contact/35 or Contact 35. y

A special feature of my invention is the adjustment of tension in spring contacts 35 and fis is welllznown, in a biased relay thefcrce required to move an armaturefrom Onere-lima tothe @that 1.1111 Includes necessary nto pull Vthe biased4 armature away raaasei from the cores toward which it lies. l provide this torce in t ie springs 35 and 3G and adjust the tension ot these springs so that they are sutlicient to cause such breakiM oit the armature from the cores. ly this means l provide a relay wherein it is no longer necessary tor the lactuated force to overcome this magnetic sticlr and accordingly l thus offset the increase in force required to movethe armature against the action of one of the springs 35 or 36. ln other words, l utilize the springs 35 and to overcome the magnetic stick and accordingly 1 am enabled to permit the actuating force to remain at the same value. :By this means l produce a relay which is biased to mid-position without necessitating an increase in the operating'force. Janother feature o1c my invention is the production of an abutting Contact closed under pressure without increase othe operating torce and, inasmuch as these contacts are the same parts which are used to return the armature to mid-position, l accomplish this result by the same method of properly tensioning the springs and 36. i Yfurther advantage of my new relay is in the use oit the same parte to produce the tension to return the armature to mid-position and to act as a contact. Another advantage of my relay arises from the provision of the cam 52 whereby l may at will convert my relay into an ordinary polarizedr relay wherein the armature remains in either position to which it has been actuated.

l: arnaware that my relay may be operated and used without the contact 22, 2li9 and 25. l am also aware that other forms of spring contacts could be used in place ot the contact 35 and S6, and by the term springl contact or resilient contact l include such substitutions as may properly be included within the scope ott my invention. l am particularly aware7 however, that one form o'j that resilient contactmight be a pivoted contact biased to position by means oiisome sort of additional springmember. l am aware oit other changes and modilications which might be made in my relay and which would sechre one or more of the objects of my invention and all such changes and modiiications which come within the scope ot the appended claims 1 deem to be a part oil my invention.

l-l ving described inv inve tion in its pred einbodimentj l ucl i l. ln a relay, a movable memben pair ot opposed biasing mem vers for returning; said movable member to mid-position, and corrunon means for rendering-*said biasing; means ineective; Y i' 2. ln arelay, a movable member, a pair ot ppcsed spring pressed members for returning;v said movable rnei'nbejr to mid-posianol- Simultaneously render:- ing said spring pressed members ineiieetive 3. In a relay, a movable contact, spring arms supported in proximity to said movable Contact adapted to impart movement in' opposite directions to the same, adjusting screws engageable with the spring arms to vary their tension and pressure upon the movable Contact, other screws engageable with the free extremities of said spring arms for limiting adjustment of the spring arms, contacts on the spring arms, engageable with the movable Contact, and means for rendering the second mentioned contacts ineffective.

In testimony whereof I aflix my signature.

CHESTER H. TEEGARDEN. 

